Whirlpool soap door

The soap door will not open, where do I start to look for the problem
whirlpool gu980scgq2

Here are your parts
Replacement parts for WHIRLPOOL GU980SCGQ2 | AppliancePartsPros.com

Here is a manual
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/d387c10d7170b7b9852571e0006e9b3e/$FILE/4322451L.pdf

See Page 9 and Page 14 “Dispenser Mechanism”